running OGo in gdb
How to deal with ogo applications from within gdb
Running OGo in gdb
There is a great page describing debugging objective-c applications using gdb on the gnustpep.org website
Just note, when you run OGo binaries from within gdb you should specify the -WOUseWatchDog NO parameter. This will prevent the watchdog to restart OGo after a crash or exception.